The coal storage yard is a large open-air material accumulation site with a relatively wide area, and there are dust from bucket wheel machines, bulldozers and other large-scale equipment. The extremely fine particles of pulverized coal on the surface of the coal pile are easily lifted by the wind, and even form a coal dust dragon, which floats for several kilometers, which not only greatly wastes precious coal resources, but also causes economic losses, and greatly pollutes the surrounding environment.
with the rapid development of modern industry, coal-fired power plants, ports and wharves, coal mines, mines, chemical plants, steel yards and other places, it is very easy to produce excessive dust, causing environmental pollution.
it is an effective method to use large spray gun to spray water to suppress dust and prevent dust. Specially designed for uniform water flow through the nozzle of tens of meters.
The main features of coal yard spray are as follows:
Principle of spray dust removal
at present, the use of spray gun to spray water can achieve dust prevention and dust reduction. The water with a certain pressure is evenly sprayed to the upper air of the coal storage yard within a certain angle range through the automatic rotating nozzle of the spray gun. After the water drops fall, the surface of the coal pile is wetted, so that the fine pulverized coal is bonded together by the tension of water molecules, and the weight of the fine pulverized coal itself is increased to avoid wind blowing dust. At the same time, it can also humidify and prolong the spontaneous combustion period of coal.
■ system composition
the spray dust-proof system is mainly composed of water source system, automatic control system, pipeline system, spray gun nozzle, control solenoid valve and protection equipment.
Selection and arrangement of spray gun
The selection of spray gun is very important, its parameters mainly include: range, flow rate, elevation angle, rotation angle, etc.
considering that the installation of spray gun in the center of the site will affect the stacking and reclaiming operation, the sprinkler spray gun should be installed around the storage yard as far as possible, most of which are arranged in rectangular and triangular ways on both sides of the yard. In another case, only one side of the spray gun is allowed on site, so the spray gun model should be selected according to the requirements of the field range. The main target is to ensure that the spray coverage rate is above 98%, and strive to minimize the number of spray guns, water supply pipelines, cables, etc., and reduce the project investment.
after the spray gun model is selected, the operating flow and pressure of the spray gun can be checked according to the performance parameter table. According to this data and the number of spray guns running at the same time (usually only 1-4 guns are operated at the same time, and the work is done in groups in turn), the water pump and water supply pipeline are designed.